Vulnerability · Published Oct 27, 2025 · Assigned by VulDB

CVE-2025-12259TOTOLINK A3300R POST Parameter cstecgi.cgi setScheduleCfg stack-based overflow

High 8.8

In plain English

A high-severity stack buffer overflow in A3300R from TOTOLINK. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)1.0%top 36.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A flaw has been found in TOTOLINK A3300R 17.0.0cu.557_B20221024. The affected element is the function setScheduleCfg of the file /cgi-bin/cstecgi.cgi of the component POST Parameter Handler. This manipulation of the argument recHour causes stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been published and may be used.

Affected products (as reported)

Vendor	Product	Versions
TOTOLINK	A3300R	17.0.0cu.557_B20221024

Weakness: CWE-121, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

References

VDB-329930 | TOTOLINK A3300R POST Parameter cstecgi.cgi setScheduleCfg stack-based overflow vdb-entry, technical-description
VDB-329930 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #673726 | TOTOLINK A3300R V17.0.0cu.557_B20221024 Buffer Overflow third-party-advisory
https://github.com/noahze01/IoT-vulnerable/blob/main/TOTOLink/A3300R/setScheduleCfg.md exploit
https://www.totolink.net/ product